First drive car cuts out! log inside.
First drive car cuts out! log inside. Seems like at about 2600+ RPM's the car cuts out and just stops till i get off the gas. Car is a 02 with dual in-tank 255's with 60lbers and a MP T70 with a 232/234 113 cam with 4l80e and 3400 stall. I am running stock rails with stock regulator for now and both pumps running all the time. I know this isn't optimum but i need to drive it for the next few weeks till i go with a return style and aftermarket regulator with a hobbs switch.
Tons of variables here to look at. Post your tune.
Was your car orginally an 4l60 or m6. if m6 assume you used conversion harness or are running full manual 4l80? If 4l60 assume you used proper harness and wiring.
You have 4l80 segment tune in there now also?
You should be ok to run stock lines and rails until likely around 600rwhp. Not sure how running stock reg works if it overuns bad with the big pumps. I have lonnies twin pump with adjustable reg,bigger rails and of 8an feed, 6an return and 60s for now going back to 80s or 120s when install upgraded turbos.
Maybe just some big mistake in tune.
I had problems with my car not wanting to go into boost it made machine gun noises and it was burnt wires .Happened a couple of times. Also you can blow out spark depending on boost so gapping to about .028 to .030 fixes that.tr6 are usually good starting point or heat range. Also have you checked fuel pressure?
Was your car orginally an 4l60 or m6. if m6 assume you used conversion harness or are running full manual 4l80? If 4l60 assume you used proper harness and wiring.
You have 4l80 segment tune in there now also?
You should be ok to run stock lines and rails until likely around 600rwhp. Not sure how running stock reg works if it overuns bad with the big pumps. I have lonnies twin pump with adjustable reg,bigger rails and of 8an feed, 6an return and 60s for now going back to 80s or 120s when install upgraded turbos.
Maybe just some big mistake in tune.
I had problems with my car not wanting to go into boost it made machine gun noises and it was burnt wires .Happened a couple of times. Also you can blow out spark depending on boost so gapping to about .028 to .030 fixes that.tr6 are usually good starting point or heat range. Also have you checked fuel pressure?
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Going to check pressure in a few. The 80 has been in there for over a year. But i am trying a new 60 to 80 tune. I think i swapped the VSS connectors when putting the tranny back in.
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Does it doing when you cruising in one of the upper gears? If so, I would try exceding those rpm's in the lower gears. I couldn't look at the scan right now but I would guess it is hitting the speed limiter. Running both pumps like that is very hard on them with stock lines and regulator in the back.
Does it doing when you cruising in one of the upper gears? If so, I would try exceding those rpm's in the lower gears. I couldn't look at the scan right now but I would guess it is hitting the speed limiter. Running both pumps like that is very hard on them with stock lines and regulator in the back.
Mine did the same thing just as I started going into boost. I put the plugs at .028 from .035 and changed the wires... that seemed to help enough to cause a trans replacement. The car is apart right now and I am going to move the gap to .025 before going back together. I had a few people tell me it could be the crank or cam sensor, but I did not log anything unusual. The afr was right on as was the timing. It felt like the rev limiter was kicking in, but I could bring it up to 3000 rpm in first and nail it. It responded beter then. It was when in load that the issue was worse. Keep us posted as to what fixed the issue...
Crank sensor usually causes no start no run . Cam sensor don't do much at all. It can make car not run that great but it will run,start a bit slower and it can make big injectors like my low impedence 120s not work .I had cam sensor problem that drove me nuts intermittent connector on sensor. Tach goes dead or intermittent with cam sensor issue as well.
Machine gun sound when going into boost is often as said wires or spark blow out.
.025 should be fine .028 to .030 should be fine too at would think up to 15psi anyway.
His problem sounds like it is hitting rev limiter likely because he has got those vss plugs backwards now.For sure something is wrong from his speedo reading weird like that.
Should be simple enough fix.
Machine gun sound when going into boost is often as said wires or spark blow out.
.025 should be fine .028 to .030 should be fine too at would think up to 15psi anyway.
His problem sounds like it is hitting rev limiter likely because he has got those vss plugs backwards now.For sure something is wrong from his speedo reading weird like that.
Should be simple enough fix.
So what did you change when it started doing this.I assume it wasn't doing this mph thing before? Maybe a speed sensor is gone bad. Or it still could be a connection /wiring issue to the sensor.
Did you convert 4l60 to 4l80 or was it t56 swap like mine? Sure nothing got whacked out in the tune.
Did you convert 4l60 to 4l80 or was it t56 swap like mine? Sure nothing got whacked out in the tune.